High-pressure spray gun



Dec. 2, 1947. w. K. BURKHOLDER HIGH PRESSURE SPRAY GUN Filed Oct. 2, 1944 IJUEL Patented Dec. 2, 1947 UNITED STATES PATENT OFFICE c -2A fl3Qt-YQ HIGH-PRESSUBESPHAY P Wilbur Kenneth Burkholder,"Shippensburg, Application October 2, 1944,. Serial N01, 556,8 46'j' 1' Claim.. 1

I This invention appertains to new and useful improvements in high pressure spray guns such as are used for spraying orchards and other foliage and plants. a

' Heretofore, much difficulty has been experienced with the valves in high pressure spray guns sticking, due it is thought, to a corrosive cohesive action which develops between the valve element and its seat while the gun is not in use. It has been found that a valve element can be easily enough pulled out of such a seat in the above described condition, but that it is very diflicult to rotate a valve element from-such a seat and inasmuch as most valves in this type of gun have been of the screw feed type, the difficulty has become a considerable problem. a Q I It is the principal object of the present invention to provide a valve for high pressure spray guns which while having a screw stem, is provided with a swivelled connection between the stem and the valve element so that a direct-pull isexerted on the valve element instead ofa rotary motion.

Other objects and advantages of the invention shall become apparent to the reader from'th'e following description:

In the drawings:

Figure 1 is a longitudinal sectional view through the gun;

Figure 2 is a cross section through the gun head taken on line 2-2 of Figure 1;

Figure 3 is a bottom plan view of the usual mist generator;

Figure 4 is a cross section taken on line 4-4 of Figure 1.

Referring to the drawings wherein like numerals designate like parts, it can be seen that numeral 5 denotes an elongated barrel which at one end is threadedly disposed into a fitting 6 having a diverged socket i internally threaded to receive one end of a high pressure supply hose, not shown. The fitting 6 has internal threads 8 and a packing gland 9 at its remaining end through which an elongated feed rod or stem I0 is disposed, this rod extending longitudinally in the barrel 5. The stem It] has a threaded portion ll working in the threads 8 of the fitting 6. The outer end of the stem I0 is provided with a handle l2 preferably of the form shown in Figure 1.

Spacer legs l3 are provided at the forward end of the stem I0.

Now referring to the head construction of the gun which for the most part is of conventional design, it can be seen that numeral I 4 consists of a nipple internally threaded at one end to 2 receivethe adjacent end-of the barrel 5 while its other end is enlarged and externally threaded for disposition inthe internally threaded end of an annulus l5-which has a passage way [6 therein for water and interposed between the inner end-of the nipple "l4 and the intermediate portion of the annulus 51s a washer l1.

The annulus 15 has an externally-threaded portion over-which a cap ring I8 is disposed, this cap ring having-an inwardly disposed flange l9 at the-inside in which is an orifice plate '20 havi-ngaspray-orifice 21;- 4 5? Beari-nglag-ainst the otherend 'of the annulus I5 is a mist generator 22 in the form of a plate havinga central port 23; this port defining a valve-seat for a'valv'e element 24."- On the top sideof the-generator plate '22 are short circumferentially disposed arcuate bulges having ducts 25 therethrough, said ducts being open substantially throughout the length thereof at the under s'ide df the'plate 22 (see Figure 3) s0 that water can pass swirlingly and mingle withthe water passing-through -the central port 23 so astddevelop a-turbulnce in the chamber 25 between the' plate 22 and the orifice plate 29, and water discharging under the presence of this turbulence, of course, results in the issuance of a mist through the orifice plate 20.

A resilient gasket 21 is interposed between the orifice plate 20 and the mist generator plate 22.

The valve element 24 has a shank 28 which is provided with an axial socket 29,and opening through the lower end thereof. The socket 29 comprises an outer portion which is interiorly threaded, an intermediate journal portion, and an inner journal portion of smaller diameter than the intermediate journal portion. The intermediate and inner journal portions of the socket form with one another an annular conical shoulder.

The valve stem i0 is provided with two reduced portions 3| and 32 which are contiguous to its inner end, the outer portion 32 being threaded and the inner portion 3| being of larger diameter than the outer portion 32. The inner end of the outer portion 32 forms with the outer end of the inner portion 3| an annular shoulder which provides a journal, while the inner end of the inner portion 3| forms with the complemental or remaining portion of the stem I!) a second annular shoulder. An externallythreaded bushing 30 is journaled on the innerreduced portion 3| of the valve stem Ill and is provided with a flange which co-acts with the second annular shoulder. The bushing 30 is received within the axial socket 29 and secured to the latter, the exteriorly disposed threads of the bushing 30 being in threaded engagement with the internally-disposed threads of the socket 29. An internally-threaded swivel nut 33 is screwed onto the outer reduced portion 32, the internallydisposed threads of the nut co-acting with the threads on the portion 32. The nut 33 is provided with a, reduced journal portion which is journaled in the inner journaled' portion of the socket 29. The nut 33 is further provided with a journal portion which is of larger diameter than the reduced journal portion and forms with the latter portion an annular conical shoulder, the conical shoulder of the nut co-acting with the conical shoulder of the socket 29. The larger journal portion of the swivel nut 33 is rotatable in the intermediate journal portion of the socket 29.

It can now be seen, that assuming that all of the parts of the gun are conventional excepting the valve element and its connection in relationship with respect to the stem 10 that when the valve element I6 is projected intoits seat, the action will be a pushing movement of the valve element by the stem l0. There will be no rotation of the valve element. Should the valve element corrode to some extent in its seat and which would ordinarily require considerable d ifficulty to remove, it can be found that by the outward pull of the valve element by the stem due to the swivelled connection 30, 3|, 33, the valve element will readily move away from its seat.

While the foregoingdescription sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is: H

In a high pressure spray gun the combination comprising a longitudinally reciprocable and simultaneo-usly rotatable valve stem and including near one end two reduced portions, the outer one of said portions being threaded and the inner of said portions being of larger diameter than the outer portion and forming an annular shoulder therewith and also forming a journal and a second annular shoulder with the remaining portion of said stem, a valve element having an axial socket opening through one end, the outer portion of said socket being threaded, a bushing journaled on'th'e inner reduced portion of saidvalve stem and having a flange c0- acting with the second shoulder formed by said inner reduced stem portion with the remaining stem portion, said bushing having exterior threads coacting with the threads of said threaded socket portion, said socket further including an intermediate journal portion and an inner journal portion of smaller diameter than the intermediate journal portion, said socket journal portions forming with one another an annular conical shoulder, a swivel nut with interior threads coacting with the threads on the outer reduced stem portion and having a reduced journal portion journaled in the inner journal portion of the socket, said nut also having a journal portion of larger diameter than the reduced journal portion and forming therewith an annular conical shoulder coacting with said conical socket shoulder, said larger journal portion of the swivel nut being rotatable in the intermediate journal portion of the socket.

WILBUR KENNETH BURKHOLDER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

